Scarifying bulldozer



Jan. 10, 1950 w. J. BLAKE SCARIFYING BULLDOZER Filed March 29, 1948INVENTOR- WJ BLAKE ATTORNEY Patented Jan. 10, 1950 UNITED STATES PATENTOFFICE SCABIFYING BULLDOZER William J. Blake, Sandy, Oreg.

Application March 29, 1948, Serial No. 17,657

1 Claim. (Cl. 37-145) stantial saving in weight compared with the use ofseparate bulldozing and scarifying units.

The second object is to so construct the device that it can be convertedfrom one use to another without an objectionable expense for labor andmaterial.

I accomplish these and other objects in the manner set forth in thefollowing specification, as

illustrated in the accompanying drawing, in which:

Fig. 1 is a perspective view of a tractor equipped with a bulldozingblade with the cutting blade in an operative position.

Fig. 2 is a perspective view showing the scarifying teeth in operativeposition.

Fig. 3 is a section taken along the line 3-3 in Fig. 1.

Fig. 4 is a section taken along the line 4-4 in Fig. 2.

Fig. 5 is a fragmentary section taken along the line 5-5 in Fig. 3.

Like numbers of reference refer to the same or similar parts throughoutthe several views.

Referring in detail to the drawing, there is shown a common form oftractor ll, having ground engaging track laying elements II and thetrunnions l2 support the arms I; and II which carry the usual bulldozerblade I5, having the cutting blade l6 attached along one edge thereof.

The construction thus far described is now in common use.

Referring particularly to my invention, the samewillbeseentoconsistinapluralityoi scarifyingteeth ll secured to thebucket the 2 blade l5, having their ends ll near the blade Hi and havingtheir scarifying points l9 projecting beyond the blade edge 29.

It is convenient to construct the arms l3 and ll of pairs of angle barswhich are welded along their diagonal corners, the endmost bars I!extend through the tips of the arms I: and Il.

The position of the blade It or the points I9 is determined by theoperator through a cable winding mechanism (not shown) whose line 21passes over a sheave 22 mounted on the tractor Ill.

The use of the device is obvious since it is merely a matter ofreversing the unit on the trunnions l2 in order to bring the desiredele-. ment into contact with the ground.

I claim:

An earth working implement consisting of arcuate elongated blade havingparallel arms at the outer ends thereof, extending rearwardly from theconvex side of the blade, a V-shaped cutting blade mounted along oneedge of said arcuate blade, a V-shaped blade edge mounted along theopposite edge of said arcuate blade, a plurality of scarifying teethcurved to conform to the back of said curved blade and secured along thewidth thereof, extending beyond the blade edge and pivotal supports forthe rearmost ends of said arms occupying a plane passing through theaxis of blade curvature and through the middle of the blade width.

WILLIAM J. BLAKE.

REFERENCES CITED The following references are of record in the file ofthis patent:

UNITED STATES PATENTS Number Name Date 178,948 Patterson June 20, 18761,741,933 Gunnison Dec. 31, 1929 2,420,027 Austin May 6, 1947

